Reply by Loren

You can grind it by hand if you want to invest several dozenmore hours in it. Lots of fun.

Seriously though, cast iron is soft enough to be scrapedand certainly filed. You can glue a sanding belt or otherlarge piece of sanding cloth to a flat man-made board, piece of metal or whatever is flat and move that overthe high spots. Just like a plane, that sanding boardwill take off the high spots and leave the low spots.

The warpage may not throw off your work in any significantway so unless the warped table is keeping you awakeat night thinking about it, you might want to try tolive with it.

Your idea about straightening the table with a bendingjig is a good one. Cast iron jointer fences for example are sometimes bent and are not hard to straighten usinga similar method.